Improving Semantic Query Answering

The retrieval problem is one of the main reasoning tasks for knowledge base systems. Given a knowledge base K and a concept C, the retrieval problem consists of finding all individuals a for which K logically entails C(a). We present an approach to answer retrieval queries over (a restriction of) OWL ontologies. Our solution is based on reducing the retrieval problem to a problem of evaluating an SQL query over a database constructed from the original knowledge base. We provide complete answers to retrieval problems. Still, our system performs very well as is shown by a standard benchmark.

• Type: Conference
• Year: 2007
• Where: DEXA
• Authors: Norbert Kottmann, Thomas Studer
• Keywords: DEXA 2007, Knowledge Base, Knowledge Base Systems, Retrieval Problems